Damping properties for vibration suppression in electrohydraulic servo-valve torque motor using magnetic fluid

Peng, Jinghui; Li, Songjing; Han, Hasiaoqier

doi:10.1063/1.4875029

Cited by 16 publications

(5 citation statements)

References 24 publications

(22 reference statements)

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“…According to [3], p* can be expressed as (4) where p is the pressure in magnetic fluid in the absence of magnetic field, p s is magnetostrictive pressure which can be negligible for an incompressible magnetic fluid, and p m is the fluid-magnetic pressure in magnetic fluid which can be expressed as (5) According to divergence theorem, for , we have (6) where da is the infinitesimal area element, n is the unit vector normal to da pointing to magnetic fluid, S m is the surface of the magnet, and S c is the surface of the container as shown in Fig. 1.…”

Section: Theoretical Analysis Of Magnetic Levitation Forcementioning

confidence: 99%

“…Later in the book titled "ferrohydrodynamic", Rosensweig gave a detailed description on the particular magnetic levitation force (selfsuspension buoyancy) by means of magnetic fluid stress tensor [3]. Up to now, this property of magnetic fluid has been exploited in many innovative devices, such as dampers [4][5][6], sensors [7][8][9][10][11], actuators [12][13][14], bearings [15,16], micromechanical system [17][18][19] and so on.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Axial Magnetic Levitation Force Acting on the Ring Magnet Suspended in Magnetic Fluid : Considering a Radial Eccentricity

Yu¹,

Li²,

Di³

et al. 2019

JMAG

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The self-suspension of magnet in magnetic fluid has been widely used in micromechanical systems, sensors, and dampers. The magnetic field associated with the ring magnet is obtained by numerical calculation and simulation through which the axial magnetic levitation force is calculated, and the numerical calculation, simulation, and experimental results agree with each other. The influence of the radial eccentricity of the ring magnet on the axial magnetic levitation force is studied, the ring magnet will experience a maximum axial magnetic levitation force without radial eccentricity. With the increase of radial eccentricity and the decrease of the distance between the bottom of the ring magnet and container, the axial magnetic levitation force will continue to decrease. But it is worth noting that the magnitude of the change caused by radial eccentricity is negligible compared to that of the axial magnetic levitation force.

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Section: Theoretical Analysis Of Magnetic Levitation Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Axial Magnetic Levitation Force Acting on the Ring Magnet Suspended in Magnetic Fluid : Considering a Radial Eccentricity

Yu¹,

Li²,

Di³

et al. 2019

JMAG

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“…8,9 A lot of work has been done to study the impact of the torque motor on EHSVs. For example, Li [10][11][12][13] analyzed the influence of magnetic fluid filled into air-gaps on the dynamic characteristics of EHSV, and concluded that the dynamic characteristics of the EHSV are improved, but the amplitude of output torque is reduced because the magnetic fluid leads to increased damping. Gordić 14 did research on the effects of the variation of torque motor parameters on servo valve operation.…”

Section: Introductionmentioning

confidence: 99%

Research on mathematical modeling of the servo valve torque motor considering the variation of working air-gaps leakage flux

Meng

Zhu

Ling

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the current research of the magnetic circuit model of the servo valve torque motor, the magnetic flux leaking from working air-gaps is regarded as constant. However, the working air-gaps leakage flux varies with the armature rotation angle, which affects the accuracy of the existing mathematical model of the torque motor. To solve this problem, a new mathematical model of the torque motor with two working air-gaps is built. First, different from the previous model, the variation of the working air-gaps leakage flux is considered in the magnetic circuit model. A more detailed mathematical model of the torque motor is established based on the magnetic circuit model. Second, the finite element method is used to reveal that there is a linear relationship between working air-gaps leakage flux and armature rotation angle in a certain range of rotation angles. Then, the new model is validated by numerical calculation, which indicates that the theoretical results calculated by this new model show better agreement with the simulation results compared to the previous model when the armature rotation angle increases. Further, the theoretical results of the electromagnetic torque constant and magnetic spring stiffness acquired by the new model and the previous model are compared. The comparison shows that the variation of the working air-gaps leakage flux has the greatest influence on the magnetic spring stiffness. Finally, the experiments on the torque motor are conducted to verify the accuracy of the new model. The theoretical results obtained by this new model are better consistent with the experimental results than that obtained by the previous model. This study shows that considering the variation of working air-gaps leakage flux is valuable to improve the accuracy of the magnetic circuit model of the torque motor, which provides an effective guidance for the structural optimization and performance prediction of the torque motor.

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“…When first invented in 1965 by NASA's Steven Papell, ferrofluids were used as a liquid rocket fuel that could be drawn toward a pump inlet in weightlessness environment by applying a magnetic field [4]. Up till now, ferrofluids have been successfully applied in many fields, such as sealing [5][6][7], lubrication [8,9], damping system, [10] sensors, [11] target drug delivery [12] and so on.…”

Section: Introductionmentioning

confidence: 99%

Study on the creep and recovery behaviors of ferrofluids

et al. 2017

Smart Mater. Struct.

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The creep and recovery behaviors of lubrication oil based ferrofluids of different particle concentration were systematically investigated to understand the viscoelasticity of ferrofluids. The influence of stress level, magnetic field strength and temperature on creep and recovery behaviors of ferrofliuids was studied experimentally and the microscopic mechanisms behind the rheological phenomenon were discussed. Linear viscoelasticity theory and generalized Burgers models were employed to analyze the experimental results. The experimental results demonstrate that the ferrofluids exhibits unique creep and recovery properties significantly different from other stimuli responsive materials both in the linear and nonlinear viscoelastic region. Furthermore, structures larger than single chains are supposed to be responsible for many experimental results, including the extended relaxation process in recovery phase and the nonlinear increasing trend of creep strain with magnetic field strength and temperature. These findings contribute to a better understanding of the microscopic mechanism of magnetorheology of ferrofluids and also provide guidance for many practical applications.

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Damping properties for vibration suppression in electrohydraulic servo-valve torque motor using magnetic fluid

Abstract: A new adaptive resonance frequency of piezoelectric components used for vibration damping Experiments on acoustic streaming in a fluid layer between vibrating surfaces and amplitude-dependent damping of vibrations

Cited by 16 publications

References 24 publications

Research on the Axial Magnetic Levitation Force Acting on the Ring Magnet Suspended in Magnetic Fluid : Considering a Radial Eccentricity

Research on the Axial Magnetic Levitation Force Acting on the Ring Magnet Suspended in Magnetic Fluid : Considering a Radial Eccentricity

Research on mathematical modeling of the servo valve torque motor considering the variation of working air-gaps leakage flux

Study on the creep and recovery behaviors of ferrofluids

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